Knowing Perl

Using it a lot isn't enough.
Keep learning things: references, objects, symbol tables, special variables, built-in functions, standard modules, XS, internals, ...
Use Perl for every programming task, even if you think it's not suited. You'll learn much, fast.
Monitor newsgroups or perlmonks.org or #perl, and see how many of the questions that are asked you can answer.

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YAPC 2000: Stages of a Perl Programmer - 45